The document discusses key aspects of computer usage and applications. It defines what a computer is and explains that it is an electronic device that can process data according to instructions. It notes some important uses of computers including data processing and storage, education, communication, banking, entertainment and more. It also discusses different computer components like the motherboard, CPU, RAM and their functions. Finally, it outlines several areas where computers have significantly impacted society and work such as education, research, business, networking and more.